The silo is widely used in the feed industry. Its function is to receive, store, unload, dump, and indicate the position of the bulk material. It plays a balanced production process, ensuring continuous production, saving manpower and improving mechanization. . The classification of silos can be divided into raw material warehouses, intermediate warehouses and finished product warehouses according to their uses. The material warehouse has silos and room warehouses, round warehouses, rectangular warehouses (including squares) and polygonal warehouses.
Round warehouse
Including the compartments of the cylinders are used for the storage of raw materials and finished products, and also for the intermediate warehouses. Its strength is good and its volume utilization is high. Rectangular or square warehouse, which is characterized by the ability to join walls, save steel and make full use of its space. Used mostly in ingredient warehouses.
The hexagonal and octagonal sides of the polygonal bin can also be connected, but the structure is more complicated and less applied. The pulverization uses a mechanical method to overcome a process of splitting due to the cohesive force inside the solid material, that is, mechanically breaking the material into small pieces by a large force.
The pulverization method is used to pulverize feeds such as grains and cakes, often by crushing, grinding, crushing and sawing.
Once crushed, it is broken by the impact of many high-speed rotary hammers installed in the crushing chamber. The main methods of this method are hammer crusher and claw mill, the most widely used,
The second mill is ground and grinded by using the hard surface of the two grinding discs with the tooth grooves, cutting and rubbing the feed to break the feed, pressing the feed pellets with positive pressure, and the two grinding discs have relative motion, thus rubbing the feed pellets. Function, the working surface can be made into a disc shape or a conical shape. This method is only used for processing dry and oil-free feed. It can be ground into various types of finished products, but contains a large amount of powder and the feed temperature is also higher. High, the steel mill has lower manufacturing costs and less power, but the iron content in the finished product is relatively high, and it is currently used less.
The crushing of the three crucibles is carried out by using two smooth rolls with a smooth surface at the same speed, and the processed feed is broken by the friction of the pressure and the working surface. This method can not fully smash the feed, and it is used less to flatten the flakes such as oats.
Four-inch sawing and shredding uses two pairs of rollers with different surfaces and different rotational speeds to cut the feed saw. The working surface has a sharp cutting angle. It is suitable for making flour, crushing grain feed and crushing the grain. The finished product of particle size produces little powder. It is not suitable for crushing feed with oil content and humidity greater than 18%. Otherwise, the groove teeth will be blocked and the feed will be hot.
How to choose the smashing method åš Hard material, crushing and crushing method is very effective, it is better to grind the tough material, and it is better to cut the brittle material. It is better to crush the grain feed and to crush and saw it. For materials with more fiber, such as enamel, it is better to use disc grinding. According to the physical and mechanical properties of the materials, the correct selection of the pulverization method has practical significance for improving the pulverization efficiency and saving energy.
Factors affecting the crushing effect of hammer mills
1. Screen diameter. The finer the pulverization, the more energy is consumed, and the increased mesh size not only saves energy, but also increases production and productivity. According to China's standards, the diameter of the mesh hole is divided into four grades, the small hole is 1-2mm, the middle hole is 3-4mm, the coarse hole is 5-6mm, and the large hole is 8mm.
2. Screen area. The open porosity increases as the mesh diameter increases and decreases as the mesh hole pitch increases. When the opening ratio is large, the pulverization efficiency and productivity are also large. Therefore, when selecting the sieve, under the premise of meeting the feed particle size standard of feeding requirements, the sieve with larger hole and smaller hole spacing should be selected. However, it should be noted that if the pitch is too small, the strength and rigidity of the screen are insufficient, and the screen is easily damaged. Wearing a large hole phenomenon. The opening ratio of foreign pulverizer sieves is over 45%, and is generally around 30% in China.
3. Humidity. The comminution efficiency is inversely proportional to the moisture content of the material. When the humidity is higher than 12-14%, the energy required for pulverization increases.
4. The end line speed of the hammer is different for different materials and the optimum line speed. The end line speed of the hammer is proportional to the pulverization fineness.
5, the thickness of the hammer, the hammer is too thick, the crushing efficiency is not high. The large pulverizer still uses a thick hammer of 5 mm due to the large size of the hammer.
6. The number of hammers and the arrangement of the hammers. When the number of hammers increases, the no-load energy consumption increases. When other conditions are the same, the crushing size becomes finer and the output decreases.
7. Hammer screen gap, hammer screen gap directly determines the thickness of the material in the crushing room. The material layer is too thick. The friction pulverization is weakened, and the powder may block the sieve holes and not easily pass through the sieve holes. The material layer is too thin, and the material is too easy to perforate, which has an effect on the crushing size.
8, grain type
9, the feed port position, there are two kinds of central feed and tangential feed, the central feed reduces the productivity by 20%, when the tangential feed, the material will directly fall into the maximum speed zone of the hammer with the air flow.
10, feeding speed, low load, low output, high energy consumption, excessive load, high output, but the life of the crusher will be shortened.
11. The air flow in the pulverizer should be sucked up for the long-term continuous operation of the pulverizer to avoid clogging the sieve holes.
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